Imports
- google.golang.org/api/option
- google.golang.org/api/iterator
- cloud.google.com/go/storage
- github.com/apache/beam/sdks/go/pkg/beam/log
- github.com/apache/beam/sdks/go/pkg/beam/util/gcsx
- github.com/apache/beam/sdks/go/pkg/beam/internal/errors
- github.com/apache/beam/sdks/go/pkg/beam/io/filesystem